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Acquisitions (Details 1) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2012
Unity
Feb. 03, 2012
Unity
Dec. 31, 2012
Other business acquisition
Patent
Item
Dec. 31, 2012
Other business acquisition
Dec. 31, 2011
CRI
Jun. 03, 2011
CRI
Jun. 03, 2011
Favorable Contracts
CRI
Retention bonus payable to Unity Employees   $ 5,000,000          
Retention bonus payable to Unity employees (in years) 3 years            
Cash deposited into escrow account   5,500,000          
Related transaction costs   600,000     3,900,000    
Cash   182,000       1,424,000  
Accounts receivable           1,140,000  
Property and equipment   51,000       965,000  
Other tangible assets   36,000 1,000,000 1,000,000   133,000  
Identified intangible assets   19,280,000 4,100,000 4,100,000   159,200,000 12,200,000
Goodwill   15,451,000 8,100,000 8,100,000   96,994,000  
Liabilities           (2,613,000)  
Total   35,000,000 13,200,000 13,200,000   257,243,000  
Estimated average useful life (in years) for intangible assets 10 years     6 years      
Number of businesses acquired     1        
Number of patent and technology acquisitions     2        
Retention bonus payable           $ 50,000,000